Reference Manual Part 2
G-Series Reference Manual 138
Course-Up (C-UP)
If you select a new course, the picture will reset to display the new
course upwards.
The reference used for Course-Up depends upon the information
available at a given time. The system prioritizes this information in
the following order:
1. Bearing from origin to destination (your intended course).
2. Locked heading from an Autopilot.
3. Bearing to waypoint.
4. Instantaneous heading.
If heading data becomes unavailable while in this mode a warning
message is displayed; the status bar puts Course-Up in brackets to
show it is suspended; and the radar uses 0° heading in relative
motion mode.
When heading data becomes available again, Course-Up mode is
reinstated.
To select an orientation mode
1. Press the PRESENTATION softkey.
2. Press RADAR MODE & ORIENTATION.
3. Choose your preferred setting under the ORIENTATION
softkey.
The selected orientation mode is displayed in the status bar.
Setting the motion mode
Motion modes control how your progress is represented on the dis-
play. The selected motion mode is displayed in the status bar. If no
position data is available, the status bar shows the motion mode in
brackets.
There are two motion modes:
• Relative motion
• True motion
The default setting is relative motion.
Relative motion (RM) with optional vessel offset
When the motion mode is set to Relative, the position of your boat
is fixed on the screen and all the targets move relative to the boat.
You can specify whether the boat is fixed in the centre of the win-
dow (0 offset) or offset by 1/3 or 2/3:
The default vessel-offset value is zero
.
True Motion (TM)
When the motion mode is set to True, fixed radar targets maintain a
constant position and moving vessels (including your boat) travel in
true perspective to each other and to fixed landmasses on the
screen. As the boat’s position approaches the edge of the screen,
the radar picture is automatically reset to reveal the area ahead of
the boat.
Current course upwards
N
N
D8400_1
As your boat's heading changes:
Radar picture fixed
SHM rotates accordingly
e.g:
D6842-2
0 offset
2
/
3
offset
1
/
3
offset